A Disc Off-Excitation Tap-Changer

Abstract

The invention discloses a disk-shaped non-excitation tap switch. The disk-shaped non-excitation tap switch comprises a switch base and a rotary shaft which is arranged on the switch base in a penetration manner, wherein the upper end of the rotary shaft is connected with an operating and positioning apparatus while a moving contact is arranged at lower end of the rotary shaft; static contacts are distributed, corresponding to the circumferential direction of the moving contact, on the switch base at intervals; the non-excitation tap switch is characterized in that each static contact comprises a static contact body and a terminal connected with the corresponding static contact body; the static contact bodies are matched with the moving contact; and the terminals extend out of the switch base and jointly turn to the direction of the branching line from the transformer coil along the circumferential direction of the switch base while the terminals are bent downwardly. The terminals of the static contacts are bent downwards and all face to the lead outlet direction of the transformer, so that the bending radius of the leads can be reduced, the occupied spaces of the tap switch and the lead part in the internal of the transformer can be reduced, the leads can be arranged more attractively, and the usage amount of the leads can be reduced.

Description

technical field [0001] The invention relates to a disc-shaped non-excitation tap changer. Background technique [0002] In the Chinese patent CN01212470.2, a disc-shaped non-excitation tap changer is disclosed. Its columnar static contacts are radially distributed outside the switch base, in the shape of annular rays, and there are holes inside the static contacts for connecting with the transformer coil. Because the transformer leads coming from both sides must have a certain bending radius when connecting with the static contacts, the outer diameter of the connecting leads of the disc-shaped off-excitation tap-changer will be relatively large. Smaller transformers will lead to a closer distance from other parts of the transformer (such as bushings and their tails) and other leads and box walls, so that the insulation reliability will be reduced. For distribution transformers, the oil tank often has to be widened The width increases the volume, weight and cost of the trans...

AI Technical Summary

Problems solved by technology

[0002] In the Chinese patent CN01212470.2, a disc-shaped non-excitation tap changer is disclosed. Its columnar static contacts are radially distributed outside the switch base, in the shape of annular rays, and there are holes inside the static contacts for connecting with the transformer coil. Because the transformer leads coming from both sides must have a certain bending radius when connecting with the static contacts, the outer diameter of the connecting leads of the disc-shaped off-excitation tap-changer will be relatively large. Smaller transformers will lead to a closer distance from other parts of the transformer (such as bushings and their tails) and other leads and box walls, so that the insulation reliability will be reduced. For distribution transformers, the oil tank often has to be widened width, resulting in an increase in transformer volume, weight and cost

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